AT90CAN32 Atmel Corporation, AT90CAN32 Datasheet - Page 243
AT90CAN32
Manufacturer Part Number
AT90CAN32
Description
Manufacturer
Atmel Corporation
Specifications of AT90CAN32
Flash (kbytes)
32 Kbytes
Pin Count
64
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
53
Ext Interrupts
8
Usb Speed
No
Usb Interface
No
Spi
1
Twi (i2c)
1
Uart
2
Can
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
2
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
4
Output Compare Channels
8
Input Capture Channels
2
Pwm Channels
7
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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19.4.4
19.4.5
19.5
19.5.1
7679H–CAN–08/08
Message Objects
Fault Confinement
Overload Frame
Number of MObs
Notes:
(c.f.
An overload frame is sent by setting an overload request (OVRQ). After the next reception, the
CAN channel sends an overload frame in accordance with the CAN specification. A status or
flag is set (OVRG) as long as the overload frame is sent.
Figure 19-9. Overload Frame
The MOb is a CAN frame descriptor. It contains all information to handle a CAN frame. This
means that a MOb has been outlined to allow to describe a CAN message like an object. The set
of MObs is the front end part of the “mailbox” where the messages to send and/or to receive are
pre-defined as well as possible to decrease the work load of the software.
The MObs are independent but priority is given to the lower one in case of multi matching. The
operating modes are:
This device has 15 MObs, they are numbered from 0 up to 14 (i=14, no MOb 15).
5. Tsjw = (1 to 4) x Tscl = (SJW[1..0]+ 1) x Tscl
Section 19.7 ”Error Management” on page
– Disabled mode
– Transmit mode
– Receive mode
– Automatic reply
– Frame buffer receive mode
1. The total number of Tscl (Time Quanta) in a bit time must be from 8 to 25.
2. PHS2[2..0] 2 is programmable to be
Instructions
OVRQ bit
OVRG bit
RXCAN
TXCAN
Ident "A"
Cmd
Setting OVRQ bit
Message Data "A"
≤
PHS1[2..0] and
248).
CRC
A
AT90CAN32/64/128
Interframe
≥
Resetting OVRQ bit
1.
Overload Frame
Overload Frame
Ident "B"
243
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